Droid X can't play video

So I took a video the other day. 20 minutes, and used all the HD time on there, but the problem is I can't even play back the video?

I got my entire gallery in there and that's the only video/picture I can't view. I tried transferring to computer and the file is 1.45 gig, so it has data in it, but I can't play it. I tried multiple players also on my pc.

Any ideas?

In my gallery it shows up as a grey icon with SD Card Unmounted or unsupported, but obviously it is considering the rest of my gallery is in there.